- 1989 - 2000 広島大学理学部附属植物遺伝子保管実験施設施設長
- 1989 - 2000 Director, Laboratory of Plant Chromosome and Gene Stock, Faculty of Science, Hiroshima University
- 2000 - - 広島大学大学院理学研究科附属植物遺伝子保管実験施設施設長
- 2000 - - 広島大学大学院理学研究科教授
- 2000 - - Director, Laboratory of Plant Chromosome and Gene Stock, Graduate School of Science, Hiroshima University
- 2000 - - Professor, Graduate School of Science, Hiroshima University
- 1989 - 1999 Hiroshima University Faculty of Science
- 1989 - 1999 Professor, Faculty of Science, Hiroshima University
- 1982 - 1989 Hiroshima University School of Integrated Arts and Sciences
- 1982 - 1989 Associate Professor, Faculty of Integrated Arts and Science, Hiroshima University
- 1979 - 1982 Hiroshima University School of Integrated Arts and Sciences
- 1979 - 1982 Lecturer, Faculty of Integrated Arts and Science, Hiroshima University
- 1976 - 1979 Hiroshima University School of Integrated Arts and Sciences
- 1976 - 1979 Research Associate, Faculty of Integrated Arts and Science, Hiroshima University
- 1976 - アメリカ合衆国メリーランド大学カレッジパーク 講師
- 1976 - Lecturer, The University of Maryland,College Park
- Tokyo University of Agriculture Faculty of Agriculture, Department of Agriculture Professor